thorlos Women's Ultra Thin Over The Calf Tech Ski Sock 65% Other Fibers, 29% Nylon, 6% Spandex Made in US No Closure closure Machine Wash Fiber Contents: 65% Exclusive THOR. WICK WARM, 29% nylon, 6% spandex Reinforced heel and toe areas provide increased durability without added thickness Exclusive THOR. WICK WARM is used for maximum WICKING because a dry foot is a warm foot Made in Statesville, North Carolina, USA 30 Day Guarantee: Thorlos feel better than ordinary socks. If you do not agree, send the socks and your receipt to Thorlos for a full refund. 65% Exclusive THOR. WICK WARM, 29% nylon, 6% spandex.